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    <script>
        // let user = {
        //     name: "宇日俱曾",
        //     age: 18
        // };
        // let clone = {};
        // Object.assign(clone, user);
        // alert(clone.age);
        let user = {
            name: "宇日俱曾",
            age: 18
        };
        user.sayHi = function() {
            alert("hello");
        }
        user.sayHi();
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